Error when using table inheritance

[nitoygo]

Using the standalone mode as described in https://atlasgo.io/guides/orms/sqlalchemy
I encounter error pointing to a line in my declarative models that inherits from another model.

[ronenlu]

@nitoygo can you give examples of the models you are using?
I have try to reproduced the issue using the next models, and it works ok.

from sqlalchemy import Column, Integer, String, ForeignKey
from sqlalchemy.ext.declarative import declarative_base

Base = declarative_base()


class Employee(Base):
    __tablename__ = 'employee'
    id = Column(Integer, primary_key=True)
    name = Column(String(50))
    type = Column(String(50))


class Manager(Employee):
    __tablename__ = 'manager'
    id = Column(Integer, ForeignKey('employee.id'), primary_key=True)
    department = Column(String(50))


class Engineer(Employee):
    __tablename__ = 'engineer'
    id = Column(Integer, ForeignKey('employee.id'), primary_key=True)
    skill_set = Column(String(50))